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Add a crude tracing mechansim for the build results

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Add a `_NIX_TRACE_BUILT_OUTPUTS` environment variable that can be set to
a filename in which the result of each build will be logged.

This is intentionally crude and undocumented as it’s only meant to be a
temporary thing to assess the usefulness of CA derivations.
Any other use would need a cleaner re-implementation first.
This commit is contained in:
regnat 2021-12-13 16:58:43 +01:00
parent 55dbb7f1cc
commit 2eec2f765a
2 changed files with 31 additions and 0 deletions
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8
src/libstore/build/derivation-goal.cc
View file

@ -17,6 +17,7 @@
#include <regex>
#include <queue>
#include <fstream>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
@ -1337,6 +1338,13 @@ void DerivationGoal::done(BuildResult::Status status, std::optional<Error> ex)
}
worker.updateProgress();
auto traceBuiltOutputsFile = getEnv("_NIX_TRACE_BUILT_OUTPUTS").value_or("");
if (traceBuiltOutputsFile != "") {
std::fstream fs;
fs.open(traceBuiltOutputsFile, std::fstream::out);
fs << worker.store.printStorePath(drvPath) << "\t" << result.toString() << std::endl;
}
}